The main character is surely the foolish fish. Depending on the story, there could be other fish characters that interact with the foolish one. Maybe there's an older, wiser fish that tries to give advice but the foolish fish doesn't listen.
The moral could be about the importance of caution. In the story, the fish might have been foolish because it didn't consider the potential dangers around it. For example, it could have been easily caught by a predator due to its lack of wariness.
In the 'lion and the foolish donkey short story', the main characters are, without a doubt, the lion and the donkey. The lion is often seen as the dominant and shrewd character. It has the ability to take advantage of the donkey. The donkey, being foolish, is the victim in this scenario. Their interactions form the basis of the story.
There is surely the foolish king himself. There might also be his advisors, who try to guide him but are often ignored. And perhaps there are some common people in the kingdom who are affected by the king's foolishness.
I don't know for sure since I haven't read it. But likely there is the foolish friend, and probably another friend or friends who are in some way connected to the foolish one. There might also be some other characters like people they meet during their adventures or misadventures.
I'm not sure as I haven't read it, but I assume the little fish is one of the main characters. There might also be other fish or sea animals like a big shark that could be a threat, or a friendly turtle that helps the little fish.
The main characters in the 'the magic fish short story' are likely to be the ones directly related to the magic fish. It could be a poor and kind - hearted individual who stumbles upon the fish. Maybe there's also a villainous character who wants to steal the fish for their own greedy purposes. And of course, the magic fish itself can be considered a character in a sense, as it has its own role to play and its magic affects the other characters in the story.
There is the girl who is the narrator of the story. She is struggling with her identity. Then there is her mother. Her mother is very traditional and wants to show their Chinese culture through the dinner. And don't forget the boy that the girl has a crush on. He comes to the dinner and his presence makes the girl feel self - conscious.
The main character is Ash Lynx. He is a complex and troubled young man who is deeply involved in the events related to banana fish.
I'm not sure specifically as the story isn't described here. But generally, there would be the foolish man himself as the main character. There might also be other characters like people who try to help him or those who are affected by his foolish actions.
There might be the fish itself as a main character. And perhaps a fisherman if the story involves fishing.